MX152594A - IMPROVEMENTS TO DESCRIBER OF VIDEO SIGNALS FOR TELEVISION SYSTEMS BY SUBSCRIPTION - Google Patents

IMPROVEMENTS TO DESCRIBER OF VIDEO SIGNALS FOR TELEVISION SYSTEMS BY SUBSCRIPTION

Info

Publication number
MX152594A
MX152594A MX82195086A MX19508682A MX152594A MX 152594 A MX152594 A MX 152594A MX 82195086 A MX82195086 A MX 82195086A MX 19508682 A MX19508682 A MX 19508682A MX 152594 A MX152594 A MX 152594A
Authority
MX
Mexico
Prior art keywords
predetermined time
video signals
describer
subscription
television systems
Prior art date
Application number
MX82195086A
Other languages
Spanish (es)
Inventor
Graham S Stubbs
John A Lund
David L Richardson
Original Assignee
Oak Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oak Industries Inc filed Critical Oak Industries Inc
Publication of MX152594A publication Critical patent/MX152594A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/171—Systems operating in the amplitude domain of the television signal

Abstract

A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals includes means for comparing the brightness level during a predetermined time period of the video signal with the brightness level of the video signal over the succeeding predetermined time period. There are means for changing from one scrambling signal to another if the difference between brightness levels in successive predetermined time periods exceeds a given value.
MX82195086A 1981-11-06 1982-11-05 IMPROVEMENTS TO DESCRIBER OF VIDEO SIGNALS FOR TELEVISION SYSTEMS BY SUBSCRIPTION MX152594A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/318,756 US4454543A (en) 1981-11-06 1981-11-06 Dynamic video scrambling

Publications (1)

Publication Number Publication Date
MX152594A true MX152594A (en) 1985-09-12

Family

ID=23239470

Family Applications (1)

Application Number Title Priority Date Filing Date
MX82195086A MX152594A (en) 1981-11-06 1982-11-05 IMPROVEMENTS TO DESCRIBER OF VIDEO SIGNALS FOR TELEVISION SYSTEMS BY SUBSCRIPTION

Country Status (8)

Country Link
US (1) US4454543A (en)
EP (1) EP0078976B1 (en)
JP (1) JPS5890881A (en)
AT (1) ATE19573T1 (en)
AU (1) AU553263B2 (en)
CA (1) CA1179765A (en)
DE (1) DE3270888D1 (en)
MX (1) MX152594A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4965825A (en) 1981-11-03 1990-10-23 The Personalized Mass Media Corporation Signal processing apparatus and methods
US7831204B1 (en) 1981-11-03 2010-11-09 Personalized Media Communications, Llc Signal processing apparatus and methods
USRE47642E1 (en) 1981-11-03 2019-10-08 Personalized Media Communications LLC Signal processing apparatus and methods
US4568974A (en) * 1982-10-28 1986-02-04 Oak Industries Inc. Video scrambling by the application of a variable periodic scrambling waveform
US4590519A (en) * 1983-05-04 1986-05-20 Regency Electronics, Inc. Television signal scrambling/descrambling system
JPS6016082A (en) * 1983-07-07 1985-01-26 Sony Corp Transmission system of scramble television signal
JPS6016083A (en) * 1983-07-07 1985-01-26 Sony Corp Television signal transmission system
CA1213972A (en) * 1983-07-13 1986-11-12 Takashi Okada Apparatus for scrambling a television signal
CA1252560A (en) * 1984-01-27 1989-04-11 Frank T. Meriwether Method and system for scrambling information signals
US4759061A (en) * 1985-11-01 1988-07-19 Zenith Electronics Corporation Technique for toggling coding mode in a television signal encoder
US4914694A (en) * 1988-04-11 1990-04-03 Eidak Corporation Modifying a television signal to inhibit recording/reproduction
US5086467A (en) * 1989-05-30 1992-02-04 Motorola, Inc. Dummy traffic generation
US5671278A (en) * 1995-05-19 1997-09-23 Pires; H. George Video scrambling with variable function generator
JP4572144B2 (en) * 2005-07-06 2010-10-27 Ｎｅｃディスプレイソリューションズ株式会社 Display panel driving apparatus and display panel driving method
US11056009B2 (en) 2018-01-31 2021-07-06 Performance Drone Works Llc Secure control and operation of drones

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE536353A (en) * 1954-03-10
US2875270A (en) * 1955-06-07 1959-02-24 Internat Telemeter Corp Subscription-television system
US2961482A (en) * 1956-11-26 1960-11-22 Paramount Pictures Corp Cryptography system
GB841627A (en) * 1956-12-20 1960-07-20 Rank Organisation Ltd Improvements in or relating to television systems
US3729576A (en) * 1971-02-08 1973-04-24 Optical Sys Corp Encoding and decoding system for catv
US3752913A (en) * 1972-06-14 1973-08-14 Bell Telephone Labor Inc Conditional replenishment video encoder with low-frequency compensation
US4024575A (en) * 1974-03-15 1977-05-17 Oak Industries Inc. Catv sine wave coding system
AT348900B (en) * 1975-02-21 1979-03-12 Eumig MONITORING DEVICE
JPS5818832B2 (en) * 1975-10-02 1983-04-14 パイオニア株式会社 Scrambling device for video signal transmission
US4216500A (en) * 1978-11-13 1980-08-05 St Louis Raymond F Encoding and decoding system
JPS55121782A (en) * 1979-03-12 1980-09-19 Clarion Co Ltd Video code process system for television
US4340906A (en) * 1980-05-14 1982-07-20 Oak Industries Inc. Video signal coding by video signal polarity reversal on the basis of brightness level comparison

Also Published As

Publication number Publication date
EP0078976A3 (en) 1983-06-22
EP0078976A2 (en) 1983-05-18
JPS5890881A (en) 1983-05-30
AU553263B2 (en) 1986-07-10
AU9021482A (en) 1983-05-12
CA1179765A (en) 1984-12-18
DE3270888D1 (en) 1986-06-05
EP0078976B1 (en) 1986-04-30
ATE19573T1 (en) 1986-05-15
US4454543A (en) 1984-06-12

Similar Documents

Publication Publication Date Title
MX152594A (en) IMPROVEMENTS TO DESCRIBER OF VIDEO SIGNALS FOR TELEVISION SYSTEMS BY SUBSCRIPTION
GB2072407B (en) Automatic signal-source selection audio or video systems
MX150241A (en) IMPROVEMENTS TO THE CODING AND DECODING SYSTEM OF AUDIO AND VIDEO SIGNALS FOR SUBSCRIPTION TELEVISION SYSTEMS
DE3474625D1 (en) Video signal scrambling and descrambling systems
GB2103410B (en) Microcomputer based video player control systems
AU534857B2 (en) Subscription television coding system
DE3483056D1 (en) TELEVISION SIGNAL TRANSMISSION SYSTEM.
IL62737A (en) Video signal coding by video signal polarity reversal on the basis of brightness level comparison
AU512925B2 (en) Subscription television decoder logic system
DE3366803D1 (en) System for encoding and decoding video signals
ES8502303A1 (en) Digital matrixing system
GB2114847B (en) Apparatus for discriminating between linear and tonal picture video signals
DE3361040D1 (en) Phase change dynamic scrambling
FI923980A (en) Video signal decoder system
FI103000B (en) A method of adjusting a threshold decoder in the case of a multilevel signal and a television receiver having such a decoder
GB8300502D0 (en) Video display systems
DE3382256D1 (en) SAFE ENCODING AND DECODING SYSTEM AND METHOD FOR TELEVISION PROGRAM SIGNALS.
MY8700393A (en) Video system with selective disable on-screen character display
GB2161669B (en) Television systems
EP0083219A3 (en) Image stabilizing in tv systems
DE3580353D1 (en) INTERACTIVE VIDEO AND AUDIO CONTROL SYSTEM.
DE3275674D1 (en) An i.c. decoder circuit
JPS55105775A (en) Binary coding system
GB2158674B (en) Television video signal processor
SU1039021A2 (en) Device for reproducing square pulses